Utah Statewide Rule

Utah Tiny Home Building Code Compliance Standards

Some RestrictionsApplies statewide across Utah (2026)

Key Facts

Foundation Standard: IRC Appendix Q
Appendix Q Threshold: ≤ 400 sq ft
Wheels Classification: RV or park model
State Authority: Utah Code 15A

Last verified: September 5, 2026Source: Utah State Legislature

Summary

Utah regulates tiny homes through the State Construction Code. Tiny homes on permanent foundations must meet the IRC including Appendix Q for dwellings under 400 square feet. Tiny homes on wheels are classified as recreational vehicles or park models with separate standards.

(1) Subject to the other provisions of this part, the following construction codes are incorporated by reference, and together with the amendments specified in Chapter 3, Statewide Amendments Incorporated as Part of State Construction Code, and Chapter 4, Local Amendments Incorporated as Part of State Construction Code, are the construction standards to be applied to building construction, alteration, remodeling, and repair, and in the regulation of building construction, alteration, remodeling, and repair in the state: (a) the 2024 edition of the International Building Code, including Appendices C and J, issued by the International Code Council; (b) the 2021 edition of the International Residential Code, issued by the International Code Council; (c) Appendix AQ of the 2021 edition of the International Residential Code, issued by the International Code Council; (d) the 2024 edition of the International Plumbing Code, issued by the International Code Council; (e) the 2024 edition of the International Mechanical Code, issued by the International Code Council;

Source: Utah State LegislatureView official code

Full Breakdown

Under Utah Code Title 15A, all dwellings must comply with the adopted International Residential Code. Utah has adopted IRC Appendix Q, which provides relaxed requirements for dwellings 400 square feet or smaller including reduced ceiling heights, ladder access to lofts, and smaller egress windows. Tiny homes on wheels are not classified as dwellings under state code but instead as recreational vehicles under Title 41 or HUD-code park model RVs, restricting their use as primary residences to lots permitted for RV or manufactured home placement. Cities retain full zoning authority over where tiny homes may locate, including minimum dwelling size requirements above the IRC floor.

Violations & Penalties

Occupying a non-compliant tiny home as a permanent residence violates state building and local zoning codes. Penalties include daily fines, condemnation, and forced relocation.

Frequently Asked Questions

Are tiny homes legal in Utah?

Yes, when built on a permanent foundation meeting IRC Appendix Q standards. Tiny homes on wheels are treated as RVs or park models and cannot serve as permanent dwellings outside designated zones.

Does Utah require a minimum house size?

State code does not set a minimum, but cities may impose minimum dwelling sizes through zoning. IRC Appendix Q allows dwellings as small as 70 square feet of habitable room area when adopted locally.

Can I park a tiny home on wheels permanently?

Generally no. Tiny homes on wheels are classified as recreational vehicles under Utah law, and most municipalities prohibit RVs as permanent residences except in licensed RV parks or manufactured home communities.

Sources

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.